Cheapest I could find for this model especially without trade in to get the deal etc. Here are the product details:

The DC54 is the only vacuum that never loses suction. With Dyson Cinetic™ cyclones – Dyson's most efficient cyclone technology – there's no need to ever replace a bag or wash a filter. Ball™ technology means DC54 turns on the spot, following you without awkward moves. And Dyson's most advanced cleaner head technology ensures high pick-up across all floors.